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Rational Judicial Behavior: A Statistical Study


William M. Landes


University of Chicago Law School; National Bureau of Economic Research (NBER)

Richard A. Posner


University of Chicago Law School; National Bureau of Economic Research (NBER)

April 2008

U of Chicago Law & Economics, Olin Working Paper No. 404
The Journal of Legal Analysis, Vol. 1, No. 2, pp. 775-831, 2009

Abstract:     
This paper analyzes the connection between ideology and voting of judges using a large sample of court of appeals cases decided since 1925 and Supreme Court cases decided since 1937. The ideological classifications of votes (e.g., liberal or conservative) are dependent variables in our empirical analysis and the independent variables include the party of the appointing President, the relative number of Republican and Democratic Senators at the time of the judge's confirmation, the appointment year, characteristics of the judge (e.g., gender, race and prior experience), and the ideological make-up of the judges on the court in which the judge sits as measured by the relative number of judges appointed by Republican and Democratic Presidents. We have a number of interesting results, including how a judge's voting's is affected by the voting of the other judges he serves with. We find a political-polarization effect among Justices appointed by Democratic but not by Republican Presidents; that is, the fewer the judges appointed by Democratic Presidents, the more liberally they vote. With regard to court of appeals judges, we find a conformity effect: if the number of judges appointed by Republican Presidents increases (decreases) relative to the number appointed by Democratic Presidents, all judges in the circuit tend to vote more conservatively (more liberally).

Number of Pages in PDF File: 63

Keywords: judicial behavior, judicial votes, judicial ideology, public choice, attitudinal theory, law and politics

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Date posted: April 29, 2008  

Suggested Citation

Landes, William M. and Posner, Richard A., Rational Judicial Behavior: A Statistical Study (April 2008). U of Chicago Law & Economics, Olin Working Paper No. 404; The Journal of Legal Analysis, Vol. 1, No. 2, pp. 775-831, 2009. Available at SSRN: http://ssrn.com/abstract=1126403

Contact Information

William M. Landes (Contact Author)
University of Chicago Law School ( email )
1111 E. 60th St.
Chicago, IL 60637
United States
773-702-9606 (Phone)
773-702-0356 (Fax)
National Bureau of Economic Research (NBER)
1050 Massachusetts Avenue
Cambridge, MA 02138
United States
Richard A. Posner
University of Chicago Law School ( email )
1111 E. 60th St.
LBQ 611
Chicago, IL 60637
United States
773-702-9608 (Phone)
773-702-0730 (Fax)
National Bureau of Economic Research (NBER)
1050 Massachusetts Avenue
Cambridge, MA 02138
United States
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